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Consolidated Statement Of Stockholders' Equity - USD ($) $ in Millions | Total | Common stock | Additional paid-in capital | Accumulated deficit | Accumulated other comprehensive income (loss) | Noncontrolling Interest [Member] | Stock-based Compensation Related [Member] | Stock-based Compensation Related [Member] Common stock | Stock-based Compensation Related [Member] Additional paid-in capital | Stock-based Compensation Related [Member] Accumulated deficit | Stock-based Compensation Related [Member] Accumulated other comprehensive income (loss) | Stock-based Compensation Related [Member] Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Sep. 30, 2016 | $ 419.5 | $ 1.6 | $ 1,563.9 | $ (1,078.9) | $ (68.3) | $ 1.2 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 123.2 |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  | (0.1) |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 123.3 | 0.0 | 0.0 | 123.3 | 0.0 |  |  |  |  |  |  |
Dividends declared | (24.0) | 0.0 | (24.0) | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Stock-based compensation | 6.2 | 0.0 | 6.2 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Shares retained for employee taxes |  |  |  |  |  |  | $ (2.7) | $ 0.0 | $ (2.7) | $ 0.0 | $ 0.0 | $ 0.0
Stock issued under stock compensation plans | 5.8 | 0.0 | 5.8 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Stock repurchased under buyback program | (55.0) | 0.0 | (55.0) | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 16.5 | 0.0 | 0.0 | 0.0 | 16.5 | 0.0 |  |  |  |  |  |
Balance at Sep. 30, 2017 | 489.5 | 1.6 | 1,494.2 | (955.6) | (51.8) | 1.1 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 106.0 |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  | 0.4 |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 105.6 | 0.0 | 0.0 | 105.6 | 0.0 |  |  |  |  |  |  |
Dividends declared | (30.1) | 0.0 | (30.1) | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Stock-based compensation | 5.2 | 0.0 | 5.2 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Shares retained for employee taxes |  |  |  |  |  |  | (2.1) | 0.0 | $ (2.1) | 0.0 | 0.0 | 0.0
Stock issued under stock compensation plans | 7.3 | 0.0 | 7.3 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Stock repurchased under buyback program | (30.0) | 0.0 | (30.0) | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | 19.0 | 0.0 | 0.0 | 0.0 | 19.0 | 0.0 |  |  |  |  |  |
Balance at Sep. 30, 2018 | 564.8 | 1.6 | 1,444.5 | (850.0) | (32.8) | 1.5 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | 64.5 |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  | 0.7 |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 63.8 | 0.0 | 0.0 |  | 0.0 |  |  |  |  |  |  |
Dividends declared | (32.0) | 0.0 | (32.0) | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Stock-based compensation | 4.3 | 0.0 | 4.3 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Shares retained for employee taxes |  |  |  |  |  |  | $ (1.3) | $ 0.0 |  | $ 0.0 | $ 0.0 | $ 0.0
Stock issued under stock compensation plans | 5.2 | 0.0 | 5.2 | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Stock repurchased under buyback program | (10.0) | 0.0 | (10.0) | 0.0 | 0.0 | 0.0 |  |  |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (3.2) | 0.0 | 0.0 | 0.0 | (3.2) | 0.0 |  |  |  |  |  |
Balance at Sep. 30, 2019 | $ 592.3 | $ 1.6 | $ 1,410.7 | $ (786.2) | $ (36.0) | $ 2.2 |  |  |  |  |  |

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